# Heat of dissolution

1. Mar 26, 2007

### moleman1985

I am designing a sulphuric acid drying absorption tower, the acid absorbpes the water vopur from a gaseous stream.
There will be a temperature increase due to three factors:-

Heat of Dissolution
Heat of Reaction
Heat of condensation

Can someone confirm this please, I think the heat of condensation will lower the temperature but there will be a temperature increase due to the other to.

I am no too sure if the heat of dissolution and reaction are the same thing, I know the heat of reaction, but cannot find the heat of dissolution which I am assuming to be around ∆Hodis = -10 kJ/mol

Thankyou. and sorry for posting three question in such a short time but they are very much linked together.

2. Mar 26, 2007

### katchum

I just wonder, how does H2SO4 react with water?

3. Mar 26, 2007

### thearny

I don't know how it reacts, but it is really really exothermic. It can't be washed off the skin because the acid boils causing more severe burns than the acid itself I believe.

I would guess dissolution and reaction are the same thing in this case. Cause I also don't really see what the reaction would be.

4. Mar 26, 2007

### moleman1985

Hello thanks for your reply I found this web site that also put me off

http://people.depauw.edu/harvey/Chem 260/pdf files/Worksheets/EnthalpyStrongAcidKey.pdf

So temperature increase is definetly caused by heat of dissolution, and some cooling by heat of water condensating or would this infact also increase the temperature? and then may be heat of reaction which I dont understand.

thankyou.

Last edited by a moderator: Apr 22, 2017
5. Mar 26, 2007

### moleman1985

Hello thanks for your reply I found this web site that also put me off

http://people.depauw.edu/harvey/Chem 260/pdf files/Worksheets/EnthalpyStrongAcidKey.pdf

So temperature increase is definetly caused by heat of dissolution, and some cooling by heat of water condensating or would this infact also increase the temperature? and then may be heat of reaction which I dont understand.

thankyou.

Last edited by a moderator: Apr 22, 2017